Semi-monolithic ring resonator

Abstract

The utility model discloses a half integral structure annular resonant cavity relates to single frequency laser field, including mechanical corner cube retroreflector and dovey prism, the mechanical corner cube retroreflector includes hollow mechanical corner cube and the three optical plane mirrors of fixed in the hollow mechanical corner cube three right angle face center position, any one of three optical plane mirrors is input mirror, and one is output mirror, and the remaining one is total reflection mirror, dovey prism is made of magneto-optic medium, and two right angle faces are all total reflection mirror. The utility model discloses a half integral structure annular resonant cavity adopts mechanical corner cube retroreflector and dovey prism to build annular resonant cavity, both have the characteristics of big misadjustment tolerance range, and theoretically not be affected by azimuth angle, compared with the plane mirror, the concave mirror of misadjustment tolerance in prior art is smaller, effectively reduces the influence of cavity mirror azimuth angle deviation to device running stability, and greatly improves the stability of annular resonant cavity.

Description

Technical Field

[0001] This utility model relates to the field of single-frequency lasers, and in particular to a semi-integral ring resonator. Background Technology

[0002] In existing technologies, an effective method for achieving single-frequency operation of a laser is the ring resonator frequency selection method based on all-solid-state lasers, i.e., a ring cavity single-frequency laser. A common ring cavity single-frequency laser has a rectangular ring resonator structure, consisting of cavity mirrors 1, 2, 3, and 4 arranged in a cyclic pattern, such as... Figure 1 As shown, cavity mirror 1 is the input mirror, cavity mirror 3 is the output mirror, and at least one of cavity mirrors 2 and 4 is a curved mirror to increase the offset tolerance range. The laser medium 5 is located after the input mirror (cavity mirror 1). Half-wave plate 6 is used for natural optical rotation, and magneto-optical medium 7 is used for magneto-induced optical rotation. 6 and 7 together form an optical one-way device combined with a ring cavity structure to ultimately achieve single laser frequency selection. The input beam 8 is input into the laser medium 5 through cavity mirror 1, and the output beam 9 is output through cavity mirror 3. This type of ring resonator has a wide range of applications in ultra-high precision measurement, quantum optical technology and applications, and optical frequency standards.

[0003] However, existing rectangular ring resonators have significant drawbacks: First, their stability is relatively weak, as their cavity mirrors are mostly plane or concave mirrors with a small offset tolerance range, making them susceptible to azimuth deviations that can lead to decreased device stability. Second, their size is relatively large, with four independent cavity mirrors and additional optical components such as half-wave plates scattered throughout, resulting in a loose overall structure that is not conducive to device integration. Third, their structure and assembly are complex, requiring additional optical components such as half-wave plates, and each cavity mirror and optical component needs to be individually adjusted and positioned, increasing design, manufacturing, adjustment, and overall cost. Furthermore, the excessive number of optical components inside the resonator further affects device stability. Utility Model Content

[0004] The main purpose of this invention is to provide a semi-integral ring resonant cavity, which can effectively solve the technical problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A semi-integral ring resonant cavity includes a mechanical pyramid retroreflector and a Dove prism. The mechanical pyramid retroreflector comprises a hollow mechanical pyramid and three optical plane mirrors fixed at the center of the three right-angled faces of the hollow mechanical pyramid. Any one of the three optical plane mirrors is an input mirror, one is an output mirror, and the remaining one is a total internal reflection mirror. The Dove prism is made of a magneto-optical medium, and both of its right-angled faces are total internal reflection mirrors. The three optical plane mirrors and the two right-angled faces are sequentially and cyclically arranged to form a ring resonant cavity. A laser medium is disposed on the incident side of the input mirror. The input beam is input into the laser medium through the input mirror, and the stimulated emission light is output through the output mirror.

[0007] As a further embodiment of this invention, both the input mirror and the output mirror are processed by optical coating technology to realize the incident beam of any wavelength beam and the partial output of the stimulated emission beam in the resonant cavity. The total reflection mirror is used to perform total reflection of the beam in the resonant cavity.

[0008] As a further embodiment of this invention, the mechanical pyramid retroreflector has a natural optical rotation function and, together with the magneto-optical medium of the Dowell prism, forms an optical one-way device to achieve single laser frequency selection.

[0009] As a further embodiment of this invention, the distance between the two right-angled faces of the Daowei prism does not exceed 10 millimeters.

[0010] As a further embodiment of this invention, the distance between any two of the three optical plane mirrors of the mechanical corner bevel retroreflector does not exceed 10 mm.

[0011] As a further embodiment of this invention, the distance between the Dove prism and the mechanical corner bevel retroreflector does not exceed 10 mm.

[0012] As a further embodiment of this utility model, the hollow mechanical pyramid is manufactured by precision machining, and the three optical plane mirrors are commercially available optical plane mirrors.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. This utility model uses a mechanical corner cone retroreflector and a Dowell prism to construct a ring resonant cavity. Both have the characteristics of a large offset tolerance range and are theoretically unaffected by the azimuth angle. Compared with the plane mirror and concave mirror in the prior art with smaller offset tolerance, it effectively reduces the impact of cavity mirror azimuth angle deviation on the stability of device operation and greatly improves the stability of the ring resonant cavity.

[0015] 2. The mechanical pyramid retroreflector integrates the functions of three cavity mirrors, while the Daowei prism integrates the functions of a magneto-optical medium and two cavity mirrors. Furthermore, the distances between the two right-angled surfaces of the Daowei prism, between the three optical plane mirrors of the mechanical pyramid retroreflector, and between the Daowei prism and the mechanical pyramid retroreflector can all be reduced to within 10 millimeters. This reduces the volume of the entire resonant cavity to less than 30% of that of a traditional ring resonant cavity, resulting in a compact structure that is more conducive to device integration and application.

[0016] 3. The mechanical pyramid retroreflector has the same natural optical rotation function as a half-wave plate, eliminating the need for an additional half-wave plate. The resonant cavity optical path contains no additional optical components besides the laser medium, simplifying the optical path structure. Simultaneously, the integrated design reduces the number of independent components, lowering the difficulty of designing, processing, adjusting, and assembling each component individually. Furthermore, the Daowei prism uses standard prism processing technology, and the mechanical pyramid retroreflector is a mature technology product, resulting in lower costs for both and thus reducing the overall cost of the system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a rectangular ring resonator in the prior art;

[0018] Figure 2 This is a schematic diagram of the retroreflection of a Dow prism, a technology currently in use.

[0019] Figure 3 A schematic diagram of the spatial three-dimensional structure of a conventional mechanical pyramid retroreflector;

[0020] Figure 4 This is a schematic diagram of the semi-integral ring resonant cavity of this utility model.

[0021] In Figure 1: 1. Cavity mirror; 2. Cavity mirror; 3. Cavity mirror; 4. Cavity mirror; 5. Laser medium; 6. Half-wave plate; 7. Magneto-optic medium; 8. Input beam; 9. Output beam.

[0022] In Figure 2: 10, Dowell prism; 11, bottom surface of Dowell prism; 12, incident beam.

[0023] In Figure 3: 13, mechanical pyramid retroreflector; 14, optical plane mirror; 15, optical plane mirror; 16, optical plane mirror; 17, hollow mechanical pyramid; 18, incident beam.

[0024] In Figure 4: 5, laser medium; 8, input beam; 13, mechanical pyramidal retroreflector; 14, optical plane mirror; 15, optical plane mirror; 16, optical plane mirror; 19, Dowell prism; 20, cavity mirror; 21, cavity mirror; 22, output beam. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0027] like Figure 4 As shown, the semi-integral ring resonant cavity of this utility model includes a mechanical pyramid retroreflector 13 and a Dowell prism 19. The mechanical pyramid retroreflector 13 is composed of a hollow mechanical pyramid 17 and three optical plane mirrors 14, 15, and 16. The hollow mechanical pyramid 17 is made by precision machining, and the three optical plane mirrors 14, 15, and 16 are commercially available optical plane mirrors, which are respectively fixed at the center of the three right-angled surfaces of the hollow mechanical pyramid 17.

[0028] Of the three optical plane mirrors, optical plane mirror 16 serves as the input mirror and is processed with optical coating technology to enable the incident beam of any wavelength; optical plane mirror 14 serves as the output mirror and is also processed with optical coating technology to output the stimulated emission portion of the light in the resonant cavity; optical plane mirror 15 serves as a total reflection mirror to perform total reflection of the beam in the resonant cavity; and the Dowell prism 19 is made of magneto-optical medium, and its two right-angled surfaces 20 and 21 are both total reflection mirrors to achieve total reflection of the beam.

[0029] Optical plane mirrors 14, 15, and 16 are sequentially and cyclically connected to the two right-angled surfaces 20 and 21 of the Dowell prism 19 to form a closed annular resonant cavity. The laser medium 5 is placed on the incident side of the input mirror optical plane mirror 16. The input beam 8 is input to the laser medium 5 through the input mirror optical plane mirror 16. The laser medium 5 is stimulated to generate radiation light, which propagates in the annular resonant cavity through reflections from each cavity mirror and the right-angled surfaces.

[0030] Since the mechanical pyramidal retroreflector 13 has a natural optical rotation function, it and the magneto-optical medium of the Dowell prism 19 form an optical one-way device to achieve the selection of a single laser frequency. Finally, the stimulated emission light is output as the output beam 22 through the output mirror optical plane mirror 14.

[0031] In terms of specific dimensions, the distance between the two right-angled surfaces 20 and 21 of the Daowei prism 19 is set to 8 mm, the distance between any two of the three optical plane mirrors 14, 15 and 16 of the mechanical corner bevel retroreflector 13 is set to 9 mm, and the distance between the Daowei prism 19 and the mechanical corner bevel retroreflector 13 is set to 10 mm, so that the volume of the entire resonant cavity is only 28% of that of the traditional rectangular ring resonant cavity, effectively realizing miniaturized integration.

[0032] In this embodiment, the precision machining of the hollow mechanical pyramid 17 ensures the installation accuracy of the three optical plane mirrors. The commercial optical plane mirrors reduce the processing cost, and the optical coating technology ensures the functionality of the input and output mirrors. The overall structure is simple, easy to assemble, and highly stable, and can be widely used in various fields that require single-frequency lasers, such as ultra-high precision measurement and optical communication.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A semi-integral ring resonant cavity, characterized in that: The system includes a mechanical pyramid retroreflector (13) and a Dowell prism (19). The mechanical pyramid retroreflector (13) includes a hollow mechanical pyramid (17) and three optical plane mirrors (14, 15, 16) fixed at the center of the three right-angled surfaces of the hollow mechanical pyramid (17). Any one of the three optical plane mirrors (14, 15, 16) is an input mirror, one is an output mirror, and the remaining one is a total reflection mirror. The Dowell prism (19) is made of a magneto-optical medium, and its two right-angled surfaces (20, 21) are both total reflection mirrors. The three optical plane mirrors (14, 15, 16) and the two right-angled surfaces (20, 21) are sequentially cyclically arranged to form a ring resonant cavity. The laser medium (5) is set on the incident side of the input mirror. The input beam (8) is input to the laser medium (5) through the input mirror, and the stimulated emission light is output through the output mirror.

2. The semi-integral ring resonator according to claim 1, characterized in that: Both the input and output mirrors are processed using optical coating technology to achieve the incident beam of any wavelength and the partial output of the stimulated emission beam in the resonant cavity. The total reflection mirror is used to perform total reflection of the beam in the resonant cavity.

3. The semi-integral ring resonator according to claim 1, characterized in that: The mechanical pyramidal retroreflector (13) has a natural optical rotation function and forms an optical one-way device with the magneto-optical medium of the Dowell prism (19) to achieve single laser frequency selection.

4. The semi-integral ring resonator according to claim 1, characterized in that: The distance between the two right-angled faces (20, 21) of the Dowell prism (19) does not exceed 10 mm.

5. The semi-integral ring resonant cavity according to claim 1, characterized in that: The distance between any two of the three optical plane mirrors (14, 15, 16) of the mechanical corner bevel retroreflector (13) does not exceed 10 mm.

6. The semi-integral ring resonator according to claim 1, characterized in that: The distance between the Dove prism (19) and the mechanical cone retroreflector (13) shall not exceed 10 mm.

7. The semi-integral ring resonator according to claim 1, characterized in that: The hollow mechanical pyramid (17) is manufactured by precision machining, and the three optical plane mirrors (14, 15, 16) are commercially available optical plane mirrors.

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